English verb conjugation
MUST PUCKER

Regular verb: pucker - puckered - puckered

Affirmation

Simple form	V-ing form
I must pucker you must pucker she must pucker we must pucker you must pucker they must pucker	I must be puckering you must be puckering she must be puckering we must be puckering you must be puckering they must be puckering
Perfect	V-ing perfect
I must have puckered you must have puckered she must have puckered we must have puckered you must have puckered they must have puckered	I must have been puckering you must have been puckering she must have been puckering we must have been puckering you must have been puckering they must have been puckering

Negation

Simple form	V-ing form
I mustn't pucker you mustn't pucker she mustn't pucker we mustn't pucker you mustn't pucker they mustn't pucker	I mustn't be puckering you mustn't be puckering she mustn't be puckering we mustn't be puckering you mustn't be puckering they mustn't be puckering
Perfect	V-ing perfect
I mustn't have puckered you mustn't have puckered she mustn't have puckered we mustn't have puckered you mustn't have puckered they mustn't have puckered	I mustn't have been puckering you mustn't have been puckering she mustn't have been puckering we mustn't have been puckering you mustn't have been puckering they mustn't have been puckering

Interrogative form

Simple form	V-ing form
must I pucker? must you pucker? must she pucker? must we pucker? must you pucker? must they pucker?	must I be puckering? must you be puckering? must she be puckering? must we be puckering? must you be puckering? must they be puckering?
Perfect	V-ing perfect
must I have puckered? must you have puckered? must she have puckered? must we have puckered? must you have puckered? must they have puckered?	must I have been puckering? must you have been puckering? must she have been puckering? must we have been puckering? must you have been puckering? must they have been puckering?

Interro-negative form

Simple form	V-ing form
mustn't I pucker? mustn't you pucker? mustn't she pucker? mustn't we pucker? mustn't you pucker? mustn't they pucker?	mustn't I be puckering? mustn't you be puckering? mustn't she be puckering? mustn't we be puckering? mustn't you be puckering? mustn't they be puckering?
Perfect	V-ing perfect
mustn't I have puckered? mustn't you have puckered? mustn't she have puckered? mustn't we have puckered? mustn't you have puckered? mustn't they have puckered?	mustn't I have been puckering? mustn't you have been puckering? mustn't she have been puckering? mustn't we have been puckering? mustn't you have been puckering? mustn't they have been puckering?